Dupnik died of "incised wounds to the upper extremities," according to a Travis County Medical Examiner's preliminary findings report.

Rivera's death was ruled a homicide. She died of "multiple sharp force injuries," Castillo said.

Dupnik has a criminal history. He was convicted at 16 of capital murder for the death of Gladys "Shorty" Fowler. He beat Fowler, 72, with a pool stick during a robbery and was sentenced to life, according to earlier reports.

Dupnik was granted parole in 2010 and was on "maximum supervision" at the time of his death, which means he was required to check in once a month with the Victoria parole office and a parole officer paid him a visit at home, said Jason Clark, a Texas Department of Criminal Justice public information officer.